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April 20th, 2011, 10:47 AM   #1
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Urgent Question about passing through magnetic fields!

Hey guys I have a final exam in an hour or two and need some help on a concept i don't quite get. The example below is pretty much what I'm wondering about.

Part B asks which way it will move. But I'm not sure where exactly you're supposed to do the right hand rule for (I,F,B) on the diagram. Doing it from different places gives different answers. I was told by someone to do it from the dashed line, but in that case, how can you choose a current direction?

Also, one other question confusing me about this is that the circuit already has a current. So for figuring out the force direction do you use this or the induced current?

Thanks in advance!
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